Real Dictionary

-ing
suffix: -ing is added to verbs to form present participles. Present participles are used with auxiliary verbs to make continuous tenses. They are also used like adjectives, describing a person or thing as doing something.

-ing in American English
forming the present participle of verbs

-ing in American English 1
suffix: a suffix of nouns formed from verbs, expressing the action of the verb or its result, product, material, etc. (the art of building; a new building; cotton wadding). It is also used to form nouns from words other than verbs (offing; shirting). Verbal nouns

-ing in American English 2
suffix: a suffix forming the present participle of verbs ( walking; thinking), such participles being often used as participial adjectives ( warring factions)

-ing in American English 3
suffix: a native English suffix meaning “one belonging to,” “of the kind of,” “one descended from,” and sometimes having a diminutive force, formerly used in the formation of nouns ( farthing; shilling; bunting; gelding; whiting)

-ing in British English 1
suffix forming nouns: the action of, process of, result of, or something connected with the verb

-ing in British English 2
suffix: forming the present participle of verbs

-ing in British English 3
suffix forming nouns: a person or thing having a certain quality or being of a certain kind